/*
 * Copyright (C) 2018 The GadTry Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.harbby.gadtry.function;

import java.util.function.Function;

import static java.util.Objects.requireNonNull;

public interface Promise<R>
{
    R call()
            throws InterruptedException;

    default <E> Promise<E> map(Function<R, E> map)
    {
        requireNonNull(map, "func is null");
        return () -> map.apply(Promise.this.call());
    }
}
